1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf623101dbf12a99aaadc7734b8a3394322821635d13bb906c8555dd90318c609. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e6c5187c-501c-4b85-8aa0-89d2331b053c.json and https://artists.proofprofile.net/proofs/artist/e6c5187c-501c-4b85-8aa0-89d2331b053c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d4a95c4d8b850d841eb57150aeb4b4c5ee551792ef9cf189d3491fe496a689. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB72485583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120cdf5c69a2f24e47fd754b3a0a9076e65e3f3384b7b666e12ffb1c9b6f4630. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB82422819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f8be9a04faa24d13358f1a2cf732d44a939a4dc5384a71689c56a2e85b55871. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB92432793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e6be2b52bf2a3303199d08122650580a93be13c1290bc0819f85c7f90f54f68. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTBA2496618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d850d9975d40bf1873a6ccdac688ad66827454777ce09632e660d236ab34a33. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTBC2414745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdebd4b9712c9720d1660fa5f197cb26f197f53386331441c207a558d3422a1b3. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTBD2430072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74816e6b8a62dceb05c9b74a781c44b54294739247e1258058a964a02e423a7d. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTBE2455491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b239a572be379cb523a4276a210d478442ee5358fe2ab5b46177cfbcfe5e00a. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWFE2413955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bed9bde21fa3ed3c7635ca23f1ba82346807a15c60e638054c9951ffc7e8af1. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWFG2483598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4e4fc05dda8c23f278c074d580afe52c904ebee858aed9b9a3803235c9abcd8. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWFL2484201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82fa5a4bf60dc1e01a45ae82aa96e0623059261c851add27eab4f3e9a17b5418. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWFL2483506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93078b5cf637404c0d68697e10d1f15e10cd8348eacfc171375e621456fa6640. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWFR2480349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3be5db0151965c0fee9be9f98c2f227b71c888005ead8e3810f19e318dded43d. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWFV2498096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x059afb6ce3e4412f50a6d8e0c69f6b07aad8326ce46a4c878c26ae11a090b1b0. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ782443414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3e01a72b123d7c3c94bd6c0c61f5d6820e7a2b5c748d2f8a902e350d7864647. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ7Q2415077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5e82e409b7432cd0dce171c94e55283ef14ad6247a20a857171f1919dde1c7e. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QT3EY2422027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49e6dc7ba75fbac5a2c0a1f65e70e67e1233734b51e374526798648c792e109b. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFYZ2516652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3867cd5bf478bc8e31a6c7e68a51180ec6f78c205f62f99ceeeff378257ce62b. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ72555545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71dc3f048c9ee9095a71ad2f2920502972a01747774f216c4447b438676831b7. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZDA72541653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5a103a928666c5411634ba6b36babb92531b191b41e95f12bac238822a53bb4. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZES72547885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6ce70f807d3c7d4d0fdcb2efa54b9de912296c6820f027e656e9d3d70912bc9. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN32582806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08ed6dab988b8521c4e0404df7d5d7e6330c1adaa030eb44467872dc2f30d58d. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWZ2539521.